A5100350263- Terahertz technology and applications
- Metal-Organic Frameworks: Synthesis and Applications
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Crystal structures of chemical compounds
- Crystallography and molecular interactions
- Advanced Photocatalysis Techniques
- Spectroscopy and Quantum Chemical Studies
- Magnetism in coordination complexes
- Covalent Organic Framework Applications
- Metal complexes synthesis and properties
- thermodynamics and calorimetric analyses
- Acoustic Wave Resonator Technologies
- Advanced Nanomaterials in Catalysis
- Molecular Sensors and Ion Detection
- Superconducting and THz Device Technology
- Advanced Chemical Physics Studies
- Organic and Molecular Conductors Research
- Optical and Acousto-Optic Technologies
- Surface Chemistry and Catalysis
- Power Systems and Renewable Energy
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- Chemical Synthesis and Analysis
- Asymmetric Hydrogenation and Catalysis
Jilin University
2022-2025
Nanjing Normal University
2018-2024
Dalian Polytechnic University
2024
Harbin Institute of Technology
2009-2022
University of Cambridge
2018-2022
Beijing University of Posts and Telecommunications
2022
Nanyang Technological University
2022
Chengdu University of Technology
2021
China University of Mining and Technology
2020
Tianjin University of Technology
2019
Abstract Novel P 2 N 4 ‐donors containing chiral 22‐membered macrocyclic ligands have been synthesized and the structures determined by an X‐ray diffraction study. The catalytic systems in situ generated from triiron dodecarbonyl, Fe 3 (CO) 12 , ligand exhibited high activity (TOF up to 1940 h −1 ) excellent enantioselectivity with 99% ee asymmetric transfer hydrogenation of various aromatic ketones.
Cadmium dihalides were reacted with pyridine derivatives as Lewis bases, and the solid state structures of 15 reaction products studied by X-ray diffraction; all but one these are reported for first time. Among complexes there 13 coordination polymers containing six-coordinated cadmium four bridging halides in equatorial two ligands axial positions a pseudo octahedron. For unidentate such 3-chloro-, bromo- or methylpyridine chain composition [CdX2(L)2]1∞ formed. The six combinations Cl, Br,...
Terahertz (THz) digital holography is realized based on a 2.52 THz far-IR gas laser and commercial 124 × pyroelectric array camera. Off-axis holograms are obtained by recording interference patterns between light passing through the sample reference wave. A numerical reconstruction process performed to obtain field distribution at object surface. Different targets were imaged test system's imaging capability. Compared with focal plane images, image quality of reconstructed images improved...
Abstract The chiral P,N,N‐ligands represented a new type of tridentate ligand developed in recent years and displayed wide utilities asymmetric catalysis. In the past decades, numerous with ferrocene, phenethylamine spiro backbones were synthesized by addition an aminopyridine, imidazole or diamines coordinating group. These showed excellent performance ruthenium, iridium, manganese, cobalt‐catalyzed hydrogenations. A range substrates, including simple ketones, α‐halogenated α‐hydroxy α‐...
Excited state intramolecular proton transfer (ESIPT) within molecules in solvents plays important roles photo-chemistry and photo-biology. Herein, the influence of 1-ethyl-3-methyl-imidazolium bis (trifluoromethylsulfonyl) imide ([EMIm][NTf2]) 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIm][PF6]) on ESIPT 4′-N,N-diethylamino-3-hydroxyflavone (DEAHF) was explored. The density functional theory time-dependent methodologies were used. calculated fluorescence spectrum reveals that peaks...
We present a high-resolution terahertz (THz) reflective imaging system, operating at 2.52 THz, that employs continuous-wave THz gas laser and pyroelectric detector. The spatial resolution was evaluated from the system's modulation transfer function tested by scanning series of targets. To further improve image quality, Lucy-Richardson method adopted to restore result. With spot profile measured using knife edge method, satisfying restoration result can be obtained. Finally, performance...
In ZIF-8 and its cobalt analogue ZIF-67, the imidazolate methyl-groups, which point directly into void space, have been shown to freely rotate - even down cryogenic temperatures. Using a combination of experimental terahertz time-domain spectroscopy, low-frequency Raman state-of-the-art ab initio simulations, methyl-rotor dynamics in ZIF-67 are fully characterized within context quantum-mechanical hindered-rotor model. The results lend insight fundamental origins experimentally observed...
Pure metal–organic framework (MOF) layers deposited on porous supports are important candidates for molecular sieving membranes, but their performance usually deviates from theoretical estimations. Here, we combine step-wise scanning electron microscopy imaging, time-resolved synchrotron X-ray scattering, terahertz infrared spectroscopy, and density functional theory calculation to investigate the ZIF-8 membrane formation two types (polydopamine TiO2) of functionalized supports. Though...
Organic molecules with excited-state intramolecular proton transfer (ESIPT) and thermally activated delayed fluorescence (TADF) properties have great potential for realizing efficient organic light-emitting diodes (OLEDs). Furthermore, 2,2'-bipyridine-3,3'-diol (BP(OH)2) is a typical molecule ESIPT TADF properties. Previously, the double state was proved to be luminescent state, T2 plays dominant role in molecule. Nevertheless, whether BP(OH)2 undergoes or single process controversial. Since...
Terahertz (THz) radiation has the characteristics of penetrating nonmetallic and nonpolar materials that are opaque to visible light, which makes THz digital holography have an application potential imaging concealed objects with certain barriers. A CO(2) pumped continuous Gabor inline holographic system was utilized conduct experimental researches on objects. Paper, Teflon, a plastic express envelope, silicon wafers were used as High-quality reconstructed images obtained. Compared...
We present a dual-axis reflection confocal scanning microscope operating at 2.52 terahertz with axial resolution of 0.67 mm. The spatial the system was evaluated by utilizing test chart. Lateral exceeded 0.314 mm, and lengthwise over 0.353 introduced 0.3 mm pinhole to improve resolution. Targets such as Chinese character "TAI" written on paper pencil metal letter "G" were scanned imaging quality. To verify ability sections, two pairs straps combinatorial ring scanned, further revealing...
A high-resolution large-area terahertz (THz) scanning imaging system is demonstrated based on a 124×124 pyroelectric array camera and CO2 pumped continuous-wave THz laser. By applying mechanism to the real-time setup, images of targets were accomplished. Self-made resolution charts employed test resolution. In order improve image quality, noise in was studied modeled, then performance several denoising methods compared with original images. The experimental results show that, help...
Experimental terahertz time-domain spectroscopy and theoretical solid-state <italic>ab initio</italic> density functional theory molecular dynamics simulations are used to elucidate the structures, dynamics, phase transformation processes of crystals undergoing a order–disorder transition.
Due to the designability of metal-organic frameworks (MOFs), semiconductor MOFs have become focus research as photocatalysts useful chemical processes utilizing clean solar energy. In this work, we developed a method tuning framework charge MOF materials and determined how can affect band edge positions bandgaps novel anionic Cd(ii) porphyrinic (PMOF) 1 ([Cd3.2(H2TCPP)2][(CH3)2NH2]1.6). It was constructed from H2TCPP4- (H6TCPP = tetrakis(4-carboxyphenyl)-porphyrin) Cd(ii), forming tube-like...
High Q-factor resonance holds great promise for bio-chemical sensing and enhanced light–matter interaction. However, terahertz (THz) magnetic resonances usually demonstrate low Q-factors, resulting in huge energy radiation loss particularly high frequency bands. Here, we show that dipole at THz frequencies can be achieved by exploiting the coherent Fano interactions with strong field enhancements an array composed of single metallic split-ring resonators, working Wood–Rayleigh anomalies. It...
Terahertz time-domain spectroscopy (THz-TDS) is applied to two polymorphs of acetylsalicylic acid (aspirin), and the experimental spectra are compared lattice dynamical calculations using high accuracy density functional theory. The confirm that forms I II have very close energetic thermodynamic properties also they show similar spectral features in far-infrared region, reflecting degree similarity their crystal structures. Unique vibrational modes identified for each polymorph which allow...
The new host molecule 1,4,15,18-tetrahydro-1,4,15,18-tetraoxodibenzo[b,h]tetraphenylene forms inclusion complexes with specific guest molecules, exhibiting two distinctly different types of lattices whose construction is dictated by intermolecular, face-to-face π···π interactions between benzoquinone rings across inversions centres.